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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3273e1f592170b53e276dac3e82131ec0b4d03630c6baba5d575de1cdbad6881' 
  AND token = 'Ab6Gzyagh5Ok8rHXL5v0GmYUt8Q2wJZX28BtozsBs0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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