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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a966980671eac2a7f919fb21a71c8c07bb2495d8e4f71fa36c9a9ba49eac84f8' 
  AND token = 'IpNFHf2mjhfNnrvpOPZOPRQu1d3BGtpncgKhlzTkhUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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