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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '050c90ccee58b335fb720be09bda08af234e8ee97abd900eb3ed4764ba748cfe' 
  AND token = 'rmUfETnJADFftvGpImigZHQjr0nq2RbbY82vqTkl5UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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