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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4615ca84cd9bfda0d1400c7aa62a72368582b8a5192de7748118c98690404dac' 
  AND token = 'jXFNGeZPSuTBdXZ8bmyecVy13BFZdwUntt8iyb6CcCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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