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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e086300d616793f98a4642be1af3168c831c5f86d467ab76ecac89e63d12b171' 
  AND token = 'IywkMJQuNFqxqfwL1vEW+29Vm94moyS24FHz+ySY72o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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