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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd955e288bedd61d3cf7366372112fe7fb7dfa0b4ddfaa7dbce0244b610323db7' 
  AND token = 'yULc44kqHb4p+30bduran+eZZEZfhbvVEQlT1CNhZ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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