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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e07af734c9ffb731ff397c784e7bc4445523f0082cb137913a953c4302da7cd3' 
  AND token = 'RquEroNy5wkT8lX/maqRmotHAbT8Elq7IKlFfXEFua8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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