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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1af39a93fd3aaa42c9f3f2b007a2c690648c2ae15fa99117dee13f88ced82d50' 
  AND token = '1RFjAMZp9eHzhAoX5JKKBO7zByWEbyhHjlJrpj2QLTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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