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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a9ed45b7edc467047922771be4d854dd381fbc43531703c8fb3942b9bd7c7ed' 
  AND token = 'WXtKye3fSKx01rPM2I4PzX3/fZlcwJnSYllzVoKrZJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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