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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33a14513cd138be4e678620edcf7a504319da1f2e70c383fce696a5d8ace8611' 
  AND token = 'Hvb/a390yTRPpKIbtCi0mHgY3Io3Mdin2b7JedNUkSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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