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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b38f35e8fa4a4dede0ce7d6c4e251bfab83dadb077222871abd4311a6a1ab0c' 
  AND token = 'Ru+ZD+c03OzQHnxuuGw/fisABLjZZykIyoBV7yoLFRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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