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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7df3d5868bcd5242ebaadab28f9e249a582a463b212c9db7ba115061149089a5' 
  AND token = '7M+rAYopGRlB7C814y634GhMZ/P1/LAmgt3B+hx2ysM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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