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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a97a27b652a33c788768525ecb65c018e24c29f6cfba7be7b1f156cd51d7b4d6' 
  AND token = 'EufaHujRke4iqkKZ5fzigQLH6Dq8/emUGyWu7Xa1254=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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