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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6195ce4c129ab523518ef8fedfbc6b459722d6701371cda9f0262fb0d12eee63' 
  AND token = 'h3RDFY7FU61H1dpECIrEJCvLkVWdJdXaHag2hujEsPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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