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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c09f3c48f778a3c7840f2a6f08f0d6dc0c24c4e2a99bf4ece659d652cd3a5b61' 
  AND token = 'OgpL1eT+2x4CEnq1XDunyIC3UD+R4M8G/ECzkjr7nGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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