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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '063d131fbe14ad679effe651952f16644f4467033b134985f26eb084c1ab6d9f' 
  AND token = 'TIWUe85yLERfQR+QSRxuUczsUmCDOOcCHXUy4q+vHW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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