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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4959688a43cfcca8601d708b0147e3c11b49cc18252b9af99098d3d44e313744' 
  AND token = 'uyWWwo07WMkbT0WN7Q1P5PCTWCSZ9E1HzbvB5JBCxLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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