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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '339b169538a59a048daefe92a8114fb69a748d11b068b116e452a4bd23f95244' 
  AND token = 'vpRCajbr9Y1NTE7TCaVmvx/FHDhgiM89nOCy1USGbGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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