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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e9074b4835c91053553b37c263b55fa565a5c2eb89e3fa667c85d45a5eedcd2' 
  AND token = '5AWPay0lej4REqfA4Vi+qAiu0QNdyE3JZwIMvALbIKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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