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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b093a790036d6835427387296348adec2d6a3cdc76bd3f5630609321007bdc3' 
  AND token = 'Po2wBOVkzlgDEeiTh0FE9zvfLREnLRgIDcIyRU9b1g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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