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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90bfe8ec7432b85a1ca01b42a66124133fb6378b6dd0dc8260f4b5db20b4ee74' 
  AND token = 'eG5mvNfmoaHIQHwcbIA8yeAzjK3GcPf/N93yumXVWJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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