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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44a8317bbb1fe9010a10d73d667abfe9c2130235e949cd6f527cded872d12293' 
  AND token = '0ddlNK2OCpvNIGelZmpQ0ve5j7mqqOvbvivAq2DJY60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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