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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2166b46fe619b1775ffb602a6717b49b92452c63809af2a6e048da6d0e481fbe' 
  AND token = 'KIbLHm+T73LOVpZsl7Twkg082BwZ3RIYmllH9M8bxnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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