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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d31d9678fc056305b444f44d0098994dea7607f9421fd3186cdc948c600e124' 
  AND token = 'cbOSrU17q3LL1LOjXCHFsoJZ1OT0s1Df+PPIspA3jjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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