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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30981f529cedb49a34ad3e39f377d37bd94479e4c3d235c3940d81458ea4133e' 
  AND token = 'jrUIWBNREKxZDT3j5JXMSDD7cD6JMG2AusB4UOwbJZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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