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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50a77993e9c5aabf4dbf3a7d9dc246b28ebd21172f10f292e7576cd0ea74f699' 
  AND token = 'InIFTsuah2NPR7zi6RQK2k1XScAmo7pn9DoWe1qo7ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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