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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceef16d6b0752d285cf139d935fe5a85ef59d0c5d3116fe6cc548a6283f77347' 
  AND token = 'todzQF8aawlTdJepN3kBji/sz0Eud6dZjX0ubxc4KXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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