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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5404b9c552158862f3481b5e8e5cec2f5a5a0ed1cb5f318146d2ef4744a75b4' 
  AND token = 'mKnVd0rthY23H5YsJXqirRDZFp94J1RRKDCNu6RW3e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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