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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca74d55385d81bf2e341c6261962e6b2081db301ff57306bc0725b2ab34829d4' 
  AND token = 'BS0EKc4VuadZ9iJU4rO7lwIOl9UAnS5oAhbOQ7dttFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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