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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1553919a775a143fde16d115514cce0c58795acd16455fa9c30f6269a1780cbb' 
  AND token = 'CAOiTwxNHZg0wwod35gxQPgNeQ9Axlw3fY/Ct0We840=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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