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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d6d9733f8e833ec0ae00bf5790bcb1ee42b2940d7ff9548ea9ccb7f49bd255f' 
  AND token = 'eBbMOc/DYG2Bqhb+WJ4eM8n7XAaCX9hX0v9hvw9dBHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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