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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5667a4fd79eb385b026a9a7fa3eaacab0b5acbe3a9b1b43b3644d799b3812e92' 
  AND token = 'eYVX4fyWBYCiv/Dyq/eASaQWThP0B9rnGyfOf+M9APc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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