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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffb507c13f55ab952257c022a6c787e58e205779cf221083d0b54fb54df28395' 
  AND token = '1kK+RE5J/tQSUZp7xpJPSjIGG9pmZn0orAkWo1a/Vr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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