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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af4dfe96084d4e946f526c9270a73b6fd52d92de10d75d93c6dc8feb3f741a76' 
  AND token = 'MOFzO8+qX5v1JxQlCi974XmCTs3nFbD+0a1SqqIBulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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