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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f04cd80b6dbeb81f63690025d0797526111879f50efc2bff18a4ad03ada74cb3' 
  AND token = '3MCNfd6d1ZdXiA5mNWfl78ypB9s23QB99bu8Gzx8Wc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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