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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4016e9798743982bfb696cac032af30be2d779f576c1a1e9fb8d13e00b08529a' 
  AND token = 'p5ovHTvTF257D99F1gdBzZPTINx+pc4R67BgWlNFYsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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