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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd40ef3dca8dd1f0b6da65a2a0416bc673011f2ab5ee72263ad1d51f933f962d5' 
  AND token = 'I3rDowv8IRmZ9S3uC4H9y/fQquMUFJrnSMkNMcjMLR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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