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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbbe8cd65178b88653df0c78481ed2c4187a387a20b89ccc5f8941e7f0cb87e1' 
  AND token = '1geCpUIbNXXiuD/qHADDaap9e6YCEfpaNZn3Ob8Sd5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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