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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c4a44dbf15cdabdb1c2df11eb1fa2ffbc063b148186d90e169848b9991a9a88' 
  AND token = 'd+L007RjLTd1YNbVPF12p7S0fTU/n5sPumHVq3X3uQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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