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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7c281b3dd4e6ebf99ef4ad067077c693e0ed8583c10d2a72e861e97fc0ceb6d' 
  AND token = 'zTsRp/PzKGnTW/AlsTWxrw0V9Sg2KwfWJT9YS4O2LI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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