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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a53c4643b0ed8d1fff0843fe03fb2fe149d12a2d22f40fadbd58e056f83e6694' 
  AND token = '6Q7tm13Q5T8kQbuFeTFoV6/wHPL9nPhEstmYoCX9Ohg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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