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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70fc19e67b7cea7b0860cdb7b85034fa2661b59d8d5a49a3f5de36ac6e42f646' 
  AND token = 'pRNSpmXO9rZitmwyIcfM38/yJmmLr7GbgCEhIhcxjtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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