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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '503f427bcc9c52a0cee5e16dc86a6d8c5d5a2c16c576c8b0ad0f25273c5282de' 
  AND token = '9OQqqtUhpMykEFFrjPA+qaA1tsT57TouMVeoXle8ADo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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