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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99367ee3949ed833c408141260b3504bf45b53d566a253e11c971c0c1c99dc85' 
  AND token = 'gEZxE6mKH+WNb/9LHMhXvfGEb9EU63pCV7rhdTmykZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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