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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4f00b8ee4b1bab499e6ac93fbf8313c8c09d348bccb1802a20a938df535ae37' 
  AND token = 'mWZyGP2QvtF5NkGfWDPM0HcduJRu0Wte50sLlorWHeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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