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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a990225325572d02ff1844110bfa761602f4a5eea7bdf0902acdec8e9cad44e' 
  AND token = '1IFtAfkGHAI/SswgLQSA39kRMi3iHSJuimKG4zoUdwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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