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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85f4df94e9fa7b87d210ca6fa06ba72250bbbc39834bb51fb93f1b6e62b47e9c' 
  AND token = 'h10XLaaJSFCFhuMM3K747898lxydp703HFSBCTKKYug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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