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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6a3011a02b828127cd8240176df791e621b8abd52736763cfcbc2b335f9f0fc' 
  AND token = 'fqEbifqfDQFJuAOrLpYMJp/on3yf76Vm4qNJ/BBlW1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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