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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cabc87a7191ea57b9a49ad42be362fef587d4d5cbd8896176cbaa17f2bd646a6' 
  AND token = '14A2lgq0l5vumRGqiq2CoLiJNwDxKFNE7P2i4AYC/Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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