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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce173beb8434efb8eb320b8436c1b098ab763678203d99338fb27197316da299' 
  AND token = 'trZcAexuuhC6tIv75x/Wrb5b8A8MoCZcRwWFLWqmhD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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