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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e6e11f6afa0cd7c262821fa0f0acc578ba0c9b3cb075fd54b2f636ca5049944' 
  AND token = 'cS75ESKKK8A+eQm9KoZVcyK1Y9xuhp3h4zdM0i1bUl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}